CN114233591B - Direct expansion type cascade organic multistage steam extraction and hot water steam return circulation solar power generation system - Google Patents
Direct expansion type cascade organic multistage steam extraction and hot water steam return circulation solar power generation system Download PDFInfo
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- CN114233591B CN114233591B CN202111494899.3A CN202111494899A CN114233591B CN 114233591 B CN114233591 B CN 114233591B CN 202111494899 A CN202111494899 A CN 202111494899A CN 114233591 B CN114233591 B CN 114233591B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/30—Solar heat collectors using working fluids with means for exchanging heat between two or more working fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/20—Working fluids specially adapted for solar heat collectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Abstract
The invention provides a direct expansion type cascade organic multistage steam extraction and hot water steam return circulation solar power generation system, and belongs to the technical field of solar thermal power generation. The heat-conducting oil thermal VP-1 is a working medium which is used for heat collection, heat storage and heat power conversion in the heat-conducting oil working medium circulation loop at the same time; the working medium of the multistage steam extraction and backheating steam circulation loop is water; the two loops realize heat exchange through the reheater, the superheater, the steam generator and the preheater. The invention combines the conventional concentrating solar heat collection-multistage steam extraction and backheating steam Rankine cycle system with the organic Rankine cycle for solar thermal power generation, and obviously improves the heat-power conversion efficiency and the heat storage capacity of the system. Meanwhile, a series of technical problems caused by high pressure bearing of a heat storage water tank and a heat collecting pipeline in a conventional water vapor direct expansion system are solved.
Description
Technical Field
The invention belongs to the technical field of solar thermal power generation, and particularly relates to a novel direct expansion-concentrating solar thermal power generation system applied to high temperature (390 ℃) by using a two-stage tank and organic-multistage steam extraction and backheating water vapor cascade Rankine cycle.
Background
A conventional trough type solar thermal power station system adopting heat conducting oil as a heat carrying working medium and molten salt as a heat accumulating working medium is shown in fig. 6. When the solar radiation is sufficient, the heat conduction oil is heated in the solar heat collection field and then respectively enters the superheater, the steam generator, the preheater and the reheater, and heat exchange is carried out between the heat conduction oil and working medium water of the multistage steam extraction and backheating steam circulation loop in the four heat exchangers, so that the water becomes high-temperature and high-pressure steam. The water vapor then enters a high pressure steam turbine and a low pressure steam turbine for expansion power generation. When the solar irradiation intensity is insufficient or no solar irradiation exists, molten salt flows from the high-temperature molten salt tank to the low-temperature molten salt tank and releases heat to the heat conduction oil, and the heat conduction oil carries out the circulating heat exchange again, so that the stable operation of the system is ensured. But it has two drawbacks: 1. the heat power conversion efficiency is generally low and is generally about 37.7%; 2. the heat conduction oil is always in a liquid phase in the heat collecting pipe, so that the average heat collecting temperature is not high, and the overall power generation efficiency is further improved.
The organic Rankine cycle (Organic Rankine cycle, ORC) is suitable for converting medium-low grade heat energy into electric energy, but the working medium is limited to conventional refrigerants, hydrocarbons, siloxanes and the like at present, the highest operating temperature is limited to about 300 ℃, and the efficiency is low. The use of biphenyl-biphenyl ether mixtures (e.g., theraminol VP-1) may be operated at temperatures approaching 400 ℃. The adoption of the thermal conduction oil thermal VP-1 in the ORC system can improve the net power generation efficiency by about 15-20%, and realize the maximum value of 30-35% of the net power generation efficiency.
On the other hand, the temperature drop of the single-tank direct expansion type (direct expansion of water in the heat collecting pipe) concentrating solar power generation system is only about 30 ℃ when the heat is released and generated, and the single-tank direct expansion type concentrating solar power generation system has the problems of low single-tank heat storage capacity, variable working condition operation of a steam turbine and the like because of limited temperature drop.
Disclosure of Invention
The invention provides a direct expansion cascade organic multistage steam extraction and hot water steam recovery circulating solar power generation system, which aims to solve the problems that the heat power conversion efficiency of a conventional double-tank molten salt system is low and the average heat absorption temperature and the heat collection efficiency are low due to the fact that heat conduction oil only undergoes liquid phase in a heat collection pipe.
The direct-expansion cascade organic multistage steam extraction and heat recovery water vapor cycle solar power generation system comprises a heat conduction oil working medium cycle and a multistage steam extraction and heat recovery water vapor cycle; the conduction oil working medium circulation loop comprises a solar heat collection field 1, an internal heat exchanger 2, a reheater 3, a superheater 4, a steam generator 5, a preheater 6, a high-temperature tank 8, a low-temperature tank 9, a first conduction oil working medium pump 17, a second conduction oil working medium pump 18 and a third conduction oil working medium pump 19; the multistage steam extraction and backheating steam circulation loop comprises a second generator 14, a high-pressure steam turbine 11, a low-pressure steam turbine 12, a condenser 7, a first water pump 15, a second water pump 16 and five closed water supply heat exchangers, and each closed water supply heat exchanger is connected with a sliding sleeve throttle valve in parallel; wherein the reheater 3, the superheater 4, the steam generator 5 and the preheater 6 realize heat exchange of two loops; the improvement is that:
the conduction oil working medium circulation loop also comprises a first generator 13 and an organic Rankine cycle turbine 10;
the outlet of the solar heat collection field 1 is communicated with the top inlet of the high-temperature tank 8, the upper outlet of the high-temperature tank 8 is communicated with the inlet of the organic Rankine cycle turbine 10, the outlet of the organic Rankine cycle turbine 10 is communicated with the heat conduction oil working medium inlet of the high-temperature section of the internal heat exchanger 2, the heat conduction oil working medium outlet of the high-temperature section of the internal heat exchanger 2 is communicated with the heat conduction oil working medium inlet of the steam generator 5, the heat conduction oil working medium outlet of the steam generator 5 is communicated with the heat conduction oil working medium inlet of the preheater 6, the heat conduction oil working medium outlet of the preheater 6 is divided into two paths, one path is communicated with the heat conduction oil working medium inlet of the low-temperature section of the internal heat exchanger 2 through the second heat conduction oil working medium pump 18, the other path is communicated with the top inlet of the low-temperature tank 9, the heat conduction oil working medium outlet of the low-temperature section of the internal heat exchanger 2 is communicated with the inlet of the solar heat collection field 1 through the third heat conduction oil working medium pump 19, the bottom outlet of the high-temperature tank 8 is divided into two paths through the first heat conduction oil pump 17, one path is communicated with the oil working medium inlet of the superheater 4, and the other path is communicated with the heat conduction oil working medium inlet of the reheater 3; the heat-conducting oil working medium outlet of the reheater 3 is divided into two paths, one path is communicated with the upper inlet of the high-temperature tank 8, the other path is communicated with the heat-conducting oil working medium inlet of the steam generator 5, the heat-conducting oil working medium outlet of the superheater 4 is divided into two paths, one path is communicated with the upper inlet of the high-temperature tank 8, and the other path is communicated with the heat-conducting oil working medium inlet of the steam generator 5;
the direct expansion cascade organic multistage steam extraction and hot water steam return circulation solar power generation system has a rated mode and a heat release mode; the state parameters and the mass flow of the conduction oil working medium circulation loop in the two modes are the same.
The technical scheme is as follows:
the solar heat collection field 1 is one of a parabolic trough heat collection field or a linear Fresnel heat collection field.
The circulation working medium of the conduction oil working medium circulation loop is conduction oil thermominol VP-1, which is a mixture of 26.5% biphenyl and 73.5% biphenyl ether.
The working temperature of the high-temperature tank 8 is 390 ℃, and the working temperature of the low-temperature tank 9 is 269-309 ℃.
Compared with the prior art, the beneficial technical effects of the invention are as follows:
1. the invention combines a conventional concentrating solar heat collection-multistage steam extraction and backheating steam circulation system with an organic Rankine cycle, and firstly provides the organic-multistage steam extraction and backheating steam cascade Rankine cycle which is applied to solar thermal power generation. The problems that the heat power conversion efficiency of a conventional double-tank molten salt system is low, and the average heat absorption temperature and the heat collection efficiency are low due to the fact that heat conduction oil only undergoes liquid phase in a heat collection pipe are solved. When the evaporation pressure of the system steam is 9MPa, the heat work conversion efficiency of the cascade organic-multi-stage steam extraction and regeneration steam circulation system is 42.01%, and when the evaporation temperature of the system is 260 ℃, the maximum heat work conversion efficiency of the cascade organic-multi-stage steam extraction and regeneration steam circulation system can reach 42.66%, and compared with the heat work conversion efficiency of the conventional concentrating solar heat collection-multi-stage steam extraction and regeneration steam circulation system, the heat work conversion efficiency of the cascade organic-multi-stage steam extraction and regeneration steam circulation system is generally improved obviously by about 37.7%. According to the invention, conduction oil thermal VP-1 is used as an organic Rankine cycle working medium, so that the operation at the temperature close to 400 ℃ is realized, and the maximum operation temperature is obviously improved compared with the maximum operation temperature of the commercial organic Rankine cycle technology which is generally limited to about 300 ℃. Compared with the conventional molten salt double-tank solar heat collection system, the molten salt flowing from the high-temperature molten salt tank to the low-temperature molten salt causes the temperature drop of about 100 ℃ (390 ℃ to 290 ℃) to be increased by more than 20 percent, and the heat storage capacity can be greatly improved by the temperature drop.
2. The invention avoids the defects of low single-tank heat storage capacity and variable-working-condition operation of the steam turbine caused by limited temperature drop (about 30 ℃) of the single-tank water vapor direct expansion (water directly expands in the heat collecting pipe) concentrating solar power generation system. The invention also avoids the complex control strategy caused by the requirement of high-superheat steam in the conventional single-tank steam direct expansion system and the defect of high heat collection and heat storage cost caused by high pressure bearing in the heat collection pipeline and the heat storage water tank (the saturated pressure of water at 250 ℃ is 4MPa, the saturated pressure of heat conduction oil theraminol VP-1 at 390 ℃ is only 0.959MPa, and the lower saturated pressure makes the storage of high-temperature heat storage working medium easier and cheaper). Meanwhile, the left heat conducting oil working medium circulation loop adopts a turbine with higher isentropic efficiency (more than 90 percent), and a series of technical challenges brought by using a wet steam turbine in a conventional direct expansion system are overcome. Compared with a single-tank direct-expansion concentrating solar organic Rankine cycle system based on organic working medium heat collection, heat storage and power generation, the heat storage density of the system provided by the invention is obviously improved (for example, the direct-expansion concentrating solar organic Rankine cycle system adopting organic working medium siloxane D4 for heat collection, heat storage and power generation, and the equivalent energy density of D4 is only 6.2 kWh/m) 3 The energy density of the system is increased to 15kWh/m when the heat conduction oil Therminol VP-1 is adopted 3 ）。
Drawings
FIG. 1 is a schematic diagram of a system according to the present invention.
Fig. 2 is a schematic diagram of a heat conducting oil working medium circulation loop.
FIG. 3 is a schematic diagram of a multistage extraction return hot water vapor cycle circuit.
Fig. 4 is a flowchart of the operation of the rated power mode.
Fig. 5 is a flow chart of the operation of the exothermic mode of operation.
Fig. 6 is a diagram of a conventional trough type solar thermal power generation system using heat transfer oil as a heat-carrying working medium and molten salt as a heat-accumulating working medium.
Fig. 7 is a temperature entropy diagram corresponding to each state point of the system.
Serial numbers in fig. 1-6 above: the solar heat collection field 1, the internal heat exchanger 2, the reheater 3, the superheater 4, the steam generator 5, the preheater 6, the condenser 7, the high-temperature tank 8, the low-temperature tank 9, the organic rankine cycle turbine 10, the high-pressure steam turbine 11, the low-pressure steam turbine 12, the first generator 13, the second generator 14, the first water pump 15, the second water pump 16, the first conduction oil working medium pump 17, the second conduction oil working medium pump 18, the third conduction oil working medium pump 19, the first heat exchanger 20, the second heat exchanger 21, the open-type feedwater heat exchanger 22, the third heat exchanger 23, the fourth heat exchanger 24, the fifth heat exchanger 25, the first throttle valve 26, the second throttle valve 27, the third throttle valve 28, the fourth throttle valve 29 and the fifth throttle valve 30.
Detailed Description
The invention is further described by way of examples with reference to the accompanying drawings.
Examples
Referring to fig. 1, the direct expansion type cascade organic multistage steam extraction and heat recovery water vapor cycle solar power generation system comprises a conduction oil working medium circulation loop and a multistage steam extraction and heat recovery water vapor circulation loop.
The conduction oil working medium circulation loop comprises a solar heat collection field 1, an internal heat exchanger 2, a reheater 3, a superheater 4, a steam generator 5, a preheater 6, a high-temperature tank 8, a low-temperature tank 9, a first conduction oil working medium pump 17, a second conduction oil working medium pump 18 and a third conduction oil working medium pump 19; the solar heat collection field 1 is a parabolic trough heat collection field, the circulating working medium of the heat conduction oil working medium circulating loop is heat conduction oil Therminol VP-1, and the heat conduction oil Therminol VP-1 is formed by mixing 26.5% of biphenyl and 73.5% of biphenyl ether. The high-temperature tank 8 and the low-temperature tank 9 form a double-tank heat conduction oil heat storage unit.
The multistage extraction back hot water steam cycle circuit comprises a second generator 14, a high pressure steam turbine 11, a low pressure steam turbine 12, a condenser 7, a first water pump 15, a second water pump 16, an open feedwater heat exchanger 22, and five closed feedwater heat exchangers. The five closed type water supply heat exchangers are a first heat exchanger 20, a second heat exchanger 21, a third heat exchanger 23, a fourth heat exchanger 24 and a fifth heat exchanger 25 respectively; each closed water supply heat exchanger is connected with a sliding sleeve throttling valve in parallel, and the five sliding sleeve throttling valves are a first throttling valve 26, a second throttling valve 27, a third throttling valve 28, a fourth throttling valve 29 and a fifth throttling valve 30 respectively; wherein the reheater 3, the superheater 4, the steam generator 5 and the preheater 6 achieve heat exchange of the two circuits. The working medium of the multistage steam extraction and backheating steam circulation loop is steam.
Referring to fig. 2, the conduction oil working medium circulation loop further comprises a first generator 13 and an organic rankine cycle turbine 10; the specific connection relation is as follows:
referring to fig. 2, an outlet of the solar thermal-arrest field 1 is communicated with a top inlet of the high-temperature tank 8, an upper outlet of the high-temperature tank 8 is communicated with an inlet of the organic rankine cycle turbine 10, an outlet of the organic rankine cycle turbine 10 is communicated with a heat-conducting oil working medium inlet of a high-temperature section of the internal heat exchanger 2, a heat-conducting oil working medium outlet of the high-temperature section of the internal heat exchanger 2 is communicated with a heat-conducting oil working medium inlet of the steam generator 5, a heat-conducting oil working medium outlet of the steam generator 5 is communicated with a heat-conducting oil working medium inlet of the preheater 6, a heat-conducting oil working medium outlet of the preheater 6 is divided into two paths, one path is communicated with a heat-conducting oil working medium inlet of a low-temperature section of the internal heat exchanger 2 through the second heat-conducting oil working medium pump 18, the other path is communicated with a top inlet of the low-temperature tank 9, an outlet of the internal heat exchanger 2 is communicated with a heat-conducting oil working medium inlet of the solar thermal-arrest field 1 through the third heat-conducting oil working medium pump 19, and a bottom outlet of the high-temperature tank 8 is divided into two paths through the first heat-conducting oil working medium pump 17, and one path is communicated with an oil working medium inlet of the reheat circuit 4; the heat-conducting oil working medium outlet of the reheater 3 is divided into two paths, one path is communicated with the upper inlet of the high-temperature tank 8, the other path is communicated with the heat-conducting oil working medium inlet of the steam generator 5, the heat-conducting oil working medium outlet of the superheater 4 is divided into two paths, one path is communicated with the upper inlet of the high-temperature tank 8, and the other path is communicated with the heat-conducting oil working medium inlet of the steam generator 5.
The working temperature of the high-temperature tank 8 is 390 ℃, and the working temperature of the low-temperature tank 9 is 269-309 ℃.
Referring to FIG. 3, the water working medium outlet of the preheater 6 is connected with the water working medium inlet of the steam generator 5, the water working medium outlet of the steam generator 5 is connected with the water working medium inlet of the superheater 4, the water working medium outlet of the superheater 4 is connected with the inlet of the high-pressure steam turbine 11, the outlet of the high-pressure steam turbine 11 is divided into three paths, one path is connected with the water working medium inlet of the reheater 3, the other two paths are respectively connected with the top inlets of the first heat exchanger 20 and the second heat exchanger 21, the water working medium outlet of the reheater 3 is connected with the inlet of the low-pressure steam turbine 12, the outlet of the low-pressure steam turbine 12 is divided into five paths, and the top inlets of the open-type water-supply heat exchanger 22, the third heat exchanger 23, the fourth heat exchanger 24 and the fifth heat exchanger 25 and the water working medium inlet of the condenser 7 are respectively connected, the water working medium outlet of the condenser 7 is communicated with the heat exchange section inlet of the fifth heat exchanger 25 through the water pump 15, the heat exchange section outlet of the fifth heat exchanger 25 is communicated with the heat exchange section inlet of the fourth heat exchanger 24, the heat exchange section outlet of the fourth heat exchanger 24 is communicated with the heat exchange section inlet of the third heat exchanger 23, the heat exchange section outlet of the third heat exchanger 23 is communicated with the inlet of the open type water supply heat exchanger 22, the outlet of the open type water supply heat exchanger 22 is communicated with the heat exchange section inlet of the second heat exchanger 21 through the water pump 16, the heat exchange section outlet of the second heat exchanger 21 is communicated with the heat exchange section inlet of the first heat exchanger 20, and the heat exchange section outlet of the first heat exchanger 20 is communicated with the water working medium inlet of the preheater 6.
The bottom outlet of the first heat exchanger 20 is communicated with the bottom inlet of the second heat exchanger 21 through a first throttle valve 26, the bottom outlet of the second heat exchanger 21 is communicated with the bottom inlet of the open type feedwater heat exchanger 22 through a second throttle valve 27, the bottom outlet of the third heat exchanger 23 is communicated with the bottom inlet of the fourth heat exchanger 24 through a third throttle valve 28, the bottom outlet of the fourth heat exchanger 24 is communicated with the bottom inlet of the fifth heat exchanger 25 through a fourth throttle valve 29, and the bottom outlet of the fifth heat exchanger 25 is communicated with the water-medium inlet of the condenser 7 through a fifth throttle valve 30.
When the system works, the system mainly comprises two modes, namely a rated mode and a heat release mode, and the working conditions (namely the state parameters and the mass flow of each point) of the multistage steam extraction and heat recovery steam circulation loop in the two modes are the same. When the multistage steam extraction and hot water steam recovery circulation loop works, superheated steam at the outlet of the high-pressure steam turbine 11 and the outlet of the low-pressure steam turbine 12 flows into the first heat exchanger 20, the second heat exchanger 21, the third heat exchanger 23-the fifth heat exchanger 25, the open type water supply heat exchanger 22 and the condenser 7 for cooling. The specific cooling flow is as follows: the water vapor from the outlet of the low-pressure steam turbine 12 is cooled in the third heat exchanger 23 and then flows through the third throttle valve 28 to enter the fourth heat exchanger 24, exchanges heat with the water vapor from the outlet of the low-pressure steam turbine 12 cooled in the fourth heat exchanger 24 and is mixed, flows through the fourth throttle valve 29 after being cooled in the fourth heat exchanger 24 after being mixed, becomes supercooled liquid water to enter the fifth heat exchanger 25, exchanges heat with the water vapor cooled in the fifth heat exchanger 25 and flows through the low-pressure steam turbine 12 outlet and is mixed with part of the water vapor flowing through the low-pressure steam turbine 12 outlet to the condenser 7, enters the condenser 7 to be cooled together, and flows into the open type water supply heat exchanger 22 after being cooled through the heat exchange sections of the water pump 15 and respectively flows through the fifth heat exchanger 25, the fourth heat exchanger 24 and the third heat exchanger 23;
the supercooled liquid water flowing through the first throttle valve 26 after the water vapor from the outlet of the high-pressure steam turbine 11 is cooled in the first heat exchanger 20 enters the second heat exchanger 21, exchanges heat with the water vapor cooled in the second heat exchanger 21 from the outlet of the high-pressure steam turbine 11 and is mixed; after being mixed, the liquid water is cooled in the second heat exchanger 21 and then flows through the second throttle valve 27, becomes supercooled liquid water, enters the open type water supply heat exchanger 22, exchanges heat with the cooled water vapor from the outlet of the low-pressure steam turbine 12 in the open type water supply heat exchanger 22, is mixed, and flows through the water pump 16 together with the liquid water from the outlet of the heat exchange section of the third heat exchanger 23, respectively flows through the second heat exchanger 21 and the heat exchange section of the first heat exchanger 20, exchanges heat, and then enters the water working medium inlet of the preheater 6.
The system of the present invention has two unique modes of operation:
(1) Nominal mode
Referring to fig. 4, the workflow of the nominal mode is marked as a thick solid line in fig. 4. Suppose when the sun is radiating directlyI DN ≥400W/m 2 When operating in this mode. The saidThe rminol VP-1 is heated in the solar heat collection field 1, and the outlet working medium enters the high-temperature tank 8. The high-temperature heat conduction oil steam at the top of the high-temperature tank 8 enters the organic Rankine cycle turbine 10 to expand and do work, the exhaust steam after doing work enters the internal heat exchanger 2 to be cooled, and then enters the steam generator 5 and the preheater 6 respectively to release heat to working medium water in the multistage steam extraction return hot water steam circulation loop. The liquid heat transfer oil at the bottom of the high temperature tank 8 flows into the superheater 4 to superheat the saturated steam entering the high pressure steam turbine 11, and flows into the reheater 3 to reheat the steam entering the low pressure steam turbine 12. In this mode, the system heat collection and power generation are performed simultaneously.
(2) Exothermic mode
Referring to fig. 5, the workflow of the exothermic mode is marked as a thick solid line in fig. 5. When no solar irradiation exists or the solar irradiation is insufficient, the high-temperature heat conduction oil liquid working medium at the bottom of the high-temperature tank 8 enters the reheater 3, the superheater 4, the steam generator 5 and the preheater 6 respectively through the first heat conduction oil working medium pump 17 to release heat to the water working medium of the multi-stage steam extraction and return hot water steam circulation loop, and the released heat is used for driving the multi-stage steam extraction and return hot water steam circulation loop. In the mode, the conduction oil working medium circulation loop at the left side is not operated, and only the multistage steam extraction and backheating water vapor Rankine cycle at the right side is operated.
The evaporating temperature of the multistage steam extraction and regeneration water vapor circulation system is #) The range is 260-310 ℃. When the evaporating temperature (+)>) At 260 ℃, the efficiency of the organic-multistage extraction and regeneration steam circulation system reaches a maximum value of 42.66%, thermodynamic parameters of each state point are shown in table 1, and a temperature entropy diagram corresponding to each state point is shown in fig. 7.
It will be readily appreciated by those skilled in the art that the foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The direct expansion cascade organic multistage steam extraction and heat recovery water vapor cycle solar power generation system comprises a conduction oil working medium cycle and a multistage steam extraction and heat recovery water vapor cycle; the conduction oil working medium circulation loop comprises a solar heat collection field (1), an internal heat exchanger (2), a reheater (3), a superheater (4), a steam generator (5), a preheater (6), a high-temperature tank (8) and a low-temperature tank (9), a first conduction oil working medium pump (17), a second conduction oil working medium pump (18) and a third conduction oil working medium pump (19); the multistage steam extraction and backheating steam circulation loop comprises a second generator (14), a high-pressure steam turbine (11), a low-pressure steam turbine (12), a condenser (7), a first water pump (15), a second water pump (16) and five closed water supply heat exchangers, wherein each closed water supply heat exchanger is connected with a sliding sleeve throttle valve in parallel; wherein the reheater (3), the superheater (4), the steam generator (5) and the preheater (6) realize heat exchange of two loops; the method is characterized in that:
the conduction oil working medium circulation loop also comprises a first generator (13) and an organic Rankine cycle turbine (10);
the outlet of the solar heat collection field (1) is communicated with the top inlet of the high-temperature tank (8), the upper outlet of the high-temperature tank (8) is communicated with the inlet of the organic Rankine cycle turbine (10), the outlet of the organic Rankine cycle turbine (10) is communicated with the heat conducting oil working medium inlet of the high-temperature section of the internal heat exchanger (2), the heat conducting oil working medium outlet of the high-temperature section of the internal heat exchanger (2) is communicated with the heat conducting oil working medium inlet of the steam generator (5), the heat conducting oil working medium outlet of the steam generator (5) is communicated with the heat conducting oil working medium inlet of the preheater (6), the heat conducting oil working medium outlet of the preheater (6) is divided into two paths, one path is communicated with a heat conducting oil working medium inlet of a low-temperature section of the internal heat exchanger (2) through a second heat conducting oil working medium pump (18), the other path is communicated with a top inlet of a low-temperature tank (9), a heat conducting oil working medium outlet of the low-temperature section of the internal heat exchanger (2) is communicated with a solar heat collection field (1) inlet, an outlet of the low-temperature tank (9) is communicated with the solar heat collection field (1) inlet through a third heat conducting oil working medium pump (19), and a bottom outlet of the high-temperature tank (8) is divided into two paths through a first heat conducting oil working medium pump (17), one path is communicated with a heat conducting oil working medium inlet of the superheater (4), and the other path is communicated with a heat conducting oil working medium inlet of the reheater (3); the heat-conducting oil working medium outlet of the reheater (3) is divided into two paths, one path is communicated with the upper inlet of the high-temperature tank (8), the other path is communicated with the heat-conducting oil working medium inlet of the steam generator (5), the heat-conducting oil working medium outlet of the superheater (4) is divided into two paths, the other path is communicated with the upper inlet of the high-temperature tank (8), and the other path is communicated with the heat-conducting oil working medium inlet of the steam generator (5); the direct expansion cascade organic multistage steam extraction and hot water steam return circulation solar power generation system has a rated mode and a heat release mode; the state parameters and the mass flow of the conduction oil working medium circulation loop in the two modes are the same.
2. The direct expansion cascade organic multistage extraction back hot water vapor cycle solar power generation system of claim 1, wherein: the solar heat collection field (1) is one of a parabolic trough heat collection field or a linear Fresnel heat collection field.
3. The direct expansion cascade organic multistage extraction back hot water vapor cycle solar power generation system of claim 1, wherein: the circulation working medium of the conduction oil working medium circulation loop is conduction oil thermominol VP-1, which is a mixture of 26.5% biphenyl and 73.5% biphenyl ether.
4. The direct expansion cascade organic multistage extraction back hot water vapor cycle solar power generation system of claim 1, wherein: the working temperature of the high-temperature tank (8) is 390 ℃, and the working temperature of the low-temperature tank (9) is 269-309 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111494899.3A CN114233591B (en) | 2021-12-08 | 2021-12-08 | Direct expansion type cascade organic multistage steam extraction and hot water steam return circulation solar power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111494899.3A CN114233591B (en) | 2021-12-08 | 2021-12-08 | Direct expansion type cascade organic multistage steam extraction and hot water steam return circulation solar power generation system |
Publications (2)
| Publication Number | Publication Date |
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| CN114233591A CN114233591A (en) | 2022-03-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102009056707A1 (en) * | 2009-04-18 | 2010-10-21 | Alstom Technology Ltd. | Steam power plant with solar collectors |
| CN207064167U (en) * | 2017-06-16 | 2018-03-02 | 中国华能集团清洁能源技术研究院有限公司 | A kind of line-focusing solar couples heat generating system |
| CN108506177A (en) * | 2018-05-04 | 2018-09-07 | 中国科学技术大学 | Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector |
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| ITFI20120273A1 (en) * | 2012-12-07 | 2014-06-08 | Nuovo Pignone Srl | "A CONCENTRATED SOLAR THERMAL POWER PLANT AND METHOD" |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009056707A1 (en) * | 2009-04-18 | 2010-10-21 | Alstom Technology Ltd. | Steam power plant with solar collectors |
| CN207064167U (en) * | 2017-06-16 | 2018-03-02 | 中国华能集团清洁能源技术研究院有限公司 | A kind of line-focusing solar couples heat generating system |
| CN108506177A (en) * | 2018-05-04 | 2018-09-07 | 中国科学技术大学 | Solar energy overlapping organic Rankine cycle power generation system based on gas-liquid two-phase heat collector |
Non-Patent Citations (1)
| Title |
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| 分级抽汽回热式太阳能低温有机朗肯循环系统的热力性能分析;韩中合;叶依林;王;;汽轮机技术(第02期);5-9 * |
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